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alkyphenol, alkyl propane diamine diacetate, quaternary ammonium compounds, and isopropanol are maintained at this facility. No evidence was encountered to indicate contamination affecting the Site as a result of operations at these adjacent properties. Live Oak reviewed the San Joaquin County Environmental Health Department's maps of Nitrate - Land Use Data and DBCP- Land Use Data dated February 20, 2019. According to the maps, no wells in the immediate vicinity of the Site have been tested for either constituent. The closest wells are approximately two miles from the Site. As the nitrate map shows (Plate 5), five wells within two miles of the Site were tested for nitrate; nitrate was detected in four of the wells at a concentration between 0.1 and 5.0 mg/L-N; no nitrate was detected in the remaining well. As depicted on the DBCP map (Plate 6), four wells within two miles of the Site were tested; no DBCP was detected in any of the wells. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate is 10 mg/L-N; the MCL for DBCP is 0.2 [g/L. 7.3 Agricultural Commissioner's Records Live Oak contacted the San Joaquin County Agricultural Commissioner's Office regarding agricultural use of the site. According to Hiromi Hernandez of that office, the Site has been used to grow corn, alfalfa, dried beans, safflower, and wheat during the past five years. A variety of agricultural chemicals have been applied to the Site during that time, as indicated on the attached documents in Appendix 5. A violation was issued in 2019 for issues related to labeling personal protective equipment (correspondence, April 27, 2020). 7.4 Department of Oil, Gas, and Geothermal Resources Maps The California Department of Oil, Gas, and Geothermal Resources (DOGGR) Well Finder website was queried on April 10, 2020 for mapped oil or gas wells within one-quarter mile of the subject Site. According to DOGGR, the southern portion of the Site is located within the Lathrop gas field (Plate 7). One gas well was identified on the Site, a plugged well identified as the Chevron USA Inc.'s "Saunders" 1 (API 0407700034). The well was drilled and abandoned in 1963; pertinent records are attached in Appendix 6. Although the modern map depicts the well south of the Site, based on the records reviewed the well appears to be located on the south side of the Site. Three additional gas wells were identified within approximately one-quarter mile of the Site: • Occidental Petroleum Corporation "P.G. Ohm" 1, a plugged, dry hole, located approximately one-quarter mile west of the Site. LOGE 20-16 8